To clarify the growth of Phragmites communis along the distance from the land, and investigate the effects by cutting the aboveground part, the height and dry weight of this species were surveyed from 2000 to 2001 on natural stands at tidal-flat of Hogog-ri, Jugog-myeon, Whaseong-city, Gyeonggi Province. At the stand near the rice paddy, mean density, mean height, dry weight per plant and dry weight per unit area of P. communis were 122.67 plants/㎡, 100.36 ㎝, 4.241 g, and 537.574/㎡, respectively. The sizes of P. communis conspicuously increased from seaside to land side. At the stand isolated from the land, these properties were 102.30 plants/㎡ (in density), 43.894 ㎝ (in height), 0.779 g/plant and 73.495 g/㎡, respectively, and the sizes of P. communis at the land side were relatively similar to those at sea side. The cutting of aboveground part resulted to the decrease of density and dry weight per unit area in next year, but did not influence on the height and weight per plant of P. communis.